XML Processing Instruction

const re = new RegExp("<\\?[\\w\\-]+(?:\\s+[\\w\\-]+\\s*=\\s*[\"'][^\"']*[\"'])*\\s*\\?>", "g");
const input = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
const matches = [...input.matchAll(re)];
console.log(matches.map(m => m[0]));

import re

pattern = re.compile(r"<\\?[\\w\\-]+(?:\\s+[\\w\\-]+\\s*=\\s*[\"'][^\"']*[\"'])*\\s*\\?>")
input_text = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
for m in pattern.finditer(input_text):
    print(m.group(0))

package main

import (
	"fmt"
	"regexp"
)

func main() {
	re := regexp.MustCompile(`<\?[\w\-]+(?:\s+[\w\-]+\s*=\s*["'][^"']*["'])*\s*\?>`)
	input := `<?xml version="1.0" encoding="UTF-8"?>`
	for _, match := range re.FindAllString(input, -1) {
		fmt.Println(match)
	}
}